Machine for grinding knives, principally those of sausage-machines or the like.



No. 700,293. Patenfed May 20, I902. n. BECKER. I MACHINE FOR GRINDINGKNIVES, PRINCIPA LLY THOSE 0F SAUSAGE MACHINES OR THE LIKE. (Applicationfiled Apr. 9, 1901.)

' 2 SheetsSheat I.

(No Model.)

' In/mZZr 02% Zack? No. 7110,293.- Patehfed May-20, I902.

U. BECKER.

MACHINE FOR GRINDING'KNIVES, PHINCIPALLY THOSE 0F SAUSAGE MACHINES 1 ORTHE LIKE.

7 (Application filed Apr. 9, 1901.) (No Model.) 2 Sheets-Sheet 2.

,2 u I 05b Banker.

THE nonms PETERS ca. PHOTO-LITHQ, WASHINGTON n. c.

' UNIT D STATES PATE T OFF ICE.

OTTO BECKER, OF BERLIN, GERMANY.-

MACHINE FOR GRINDING KNIVES, PRINCIPA'LLY THOSE-0F SAUSAGE-MACHINVESORTH; LIKE.-

SPECIFICATION forming part of Letters Patent No. 700,293, dated May1902.

Application filed Aprile, 1901. s a No.'55,045. (No'modeh) i v To allwhom it may concern.

of the Emperor of Germany, residing and having my post-olfice address at46 Weidenweg,

Berlin, Germany, have invented a new or Improved Machine for GrindingKnives, Prin-- had to be sent to grinding establishments,

where they were ground by hand on emerywheels. Of course it could not beavoided in this process that the knives were often burned, owing toinsuflicient attention being paid to their cooling; but, above all,great skill of the grinder was required in order to produce the wereoften straightened exactly in the same.v correct,

manner, in consequenceyof which a cut was never produced.

The object of the present invention is to re-- move all theseinconveniences. By'means of the new grinding apparatus all butchers, andeven other persons without any special knowledge of grinding, are ableto grind the knives without further difficulty in a mechanical Way, andso that they fulfil all conditions by which the hollow grinding of allblades of the knives is perfectly uniform whether the knife is ground onone or'both sides and independent of its construction. Burning theknives is also avoided by means of a cooling device, While formerly'theknife ,had to be held by hand against the revolving emery grindingwheeland moved to and fro, it is only necessary in the improved grindingapparatus to put'the emery-wheel into revolution,by'which the blades ofthe knife adjusted against the V place the knife in a holding deviceandthen it Be it known that I, OTTO BECKER, asubj ect-V said wheel are allperfectly hollow ground'inv the'same manner. In order to grind thefollowing blade exactly in the same manner as the first one, the knifeneed not be removed and reinserted in its holder; but by means of asimple manipulation the said following blade is put into the positionpreviously 00-.

cupied by the first one, whereupon the grinding takes place. As all theblades of the knife are ground in exactly the same manner, they mustnecessarily all be perfectly uniform, and the following blades are giventhe same hollow grinding as the first one by'means of constantlyretaining the same position of the knife against the emery-wheel.

A form of construction of the present invention is shown in the annexeddrawings, in which- Figure 1 shows a side view of the grindingapparatus; Fig. 2, a plan view; Fig. 3, a front view. Fig.4: shows theadjustment'of the apparatus for the grinding of the second side of theblade of double-edged knives. Fig.

'5 is an elevation of one form of knife on an of knife, and Fig. 8 aplan view thereof. Fig.

9 is an elevation of the knife-holder, and Fig. 10 a verticalcross-section thereof. I

The grinding apparatus, which may be arrangedso as to be driven eitherby hand or machinery, consists of a grindstone or emery grinding-wheel,which is put into revolution and simultaneously in a to-and-fro movementby the operating-wheel, and of aholder orsupport for holding the knife,the said holder or support being movable both in a longitudinal andtransverse direction.

The emery grinding wheel or stone a is suitably fixed on a shaft 1),adapted to, revolve in brackets d, placed on a foundation plate c.

The displacement of this shaftinitsaxialdh rection'corresponds to thegreatest, length of the corresponding blade of the knife and is elfectedby means of the following arrangerevolving in the block g. Theoperatingwheel 70, mounted on a shaft revolving in the bracket -i, isconnected with the pulley Z by means of straps or cords, said pulley Zbeing fixed to the shaft Z), and simultaneously effects the revolutionof the shaft h-for instance, by means of bevel-gears m and n-so that onthe said wheel is being rotated the shaft 1), with the emery-wheel a, isput into a rotation' corresponding to the ratio of gear, the

shaft It, with the disk f, being also revolved at the same time, bywhich the emery-Wheel (t revolves and at the same time is moved to andfro in an axial direction under the influ ence of the lever 6, accordingto the throw of the eccentric. The blade of the knife held by the holderagainst the grinding-wheel is thus symmetrically ground along its wholelength, and the hollow smoothness of the edge is perfectly uniform inevery respect.

The knife-holder is constructed as follows: A disk 8, revoluble on ashaft 0', is arranged inclined to the emery-wheel a, the said disk .9being arranged on a support g, which is placed on the base-plate e andwhich can be displaced longitudinally and transversely by means ofscrews 0 and p. In the said disk a screw t, having right and left handthreads, is arranged in such a manner that on said screw being turned inthe one or other direction two clamping-cheeks u, the ends of which areclaw-shaped and project from the disk 3, can be moved to or from eachother, so that the knife '2), which is adjusted on the disk .9 and intothe socket of which the claws of the clamping-cheeks a catch on turningthe screw t, is firmly fixed by means of the clampingcheeks 14- beingdrawn apart. The disk 3 can be displaced in certain positions in suchamanner that the blade of the knife "0 which at the moment is to beground always occupies a horizontal position with reference tothe-grinding-wheel a. For this purpose holes 70, corresponding to thenumber of blades forinstance, fourare provided in the disk 3, into whichholes a bolt a: is inserted. In addition to the knives shown in Figs. 5and 6 others with differently-arranged sockets are sometimes used, asshown in Figs. 7 and 8. In this case the disk 3, for the purpose ofenabling knives with their bladesof the lastmentioned construction to beinserted into the determined position, is not only provided with fourholes to, but with eight such holes for reception of the bolt :10, sothat also knives of this construction can be placed in position on thedisk 3 of the same apparatus without any further manipulation.

In-order that double-edged knives, as shown in Figs. 7and 8, may beground withouttrouble in the same apparatus, the support q, with thedisk 3 thereon, can be displaced transversely to the emerygrinding-wheel a by means of the screw 13. Since the hollow grinding ofthe said double-edged knives on the left-hand side is contrary to thatof the right-hand side, the knife, after all four blades have beenground on the right-hand side, is

removed and reinserted with the left-hand side placed in position on thedisk 8 against the grinding-wheel. Thegrinding-wheel is then moved untilit has reached the limit of its displacement in the outwarddirection,whereupon the disk 8, with the knife, is brought by turningthe screw 1) so far outward, as shown in Fig. 4, that the extreme edgeof the grinding-wheel Ct forms a straight line with the socket of theknife, so that the blade which is placed inwardly is ground in the samemanner as the outward blade in the before-mentioned single-edged knife.In order to grind all blades uniformly that is to say, all the blades tothe same extent-the displacement of the disk .9 toward thegrinding-wheel a is limited by suitable means-for instance, anadjustable stop or the like. A suitably-arranged water vessel serves tocool the knife, with its blades, during the grinding, in order to avoida burning of the steel.

The operation of the apparatus isas follows: The knife is so arranged onthe disk 3 that the claws of the clamping-cheeks to catch into thesocket thereof, and itis then fixed by means of turning the screw 15.revolution of the disk 8 on its axle 4' a blade of the knife is broughtinto the horizontal position and the said disk 5 held in thisposiblades-is then brought by the screw 0 against the emery-wheel andthe latter put into rota-- tion by means of the wheel 7t, by which thesaid emery grinding-wheel simultaneously receives a to-and-fro motionthrough the before-mentioned eccentric lever e, in consequence of whichthe blade of the knife is uniformly ground along its whole length. Whenone blade is sufficiently ground, the support q is stopped by the stopor thelike. The said support, with the knife thereon, is then moved backsomewhat by turning the screw 0 in the opposite direction. The disk 8 isset free and turned so that the following blade of the knife is broughtinto the horizontal position previously occupied by the first blade.disk .9 it is again brought against the grinding-wheel by turning thescrew 0,-and on the said grinding-wheel being put into rotation theadjusted blade is ground in the same manner as the previous one. It canonly be ground to the same extent as the first one, since thedisplacement of the disk 5 and the knife against the grindingwheel islimited by the abutment z or the like. When the second blade is ground,it is removed from the grinding-wheel in the same manner as the firstone, and the following blade is placed in position, and so on. The bladeof the knife which at the moment is inserted is cooled during thegrinding in a suitable water vessel to prevent it from being burned. Ifthe knife is a double-edged one, as mentioned After the bolting orfixing of the arranged blade is first ground instead of the above, aftergrinding all blades on oneside,

the knife is removed and reinserted with the other side against thegrinding-wheel. Since the hollow grinding of this side is contrary tothat of the side already ground, the inwardlyoutward one. For thispurpose the grindingwheel is moved outwardly to the extreme point of itsdisplacement, and the disk 3, with the knife thereon, is brought back bymeans of the screw 10, as shown in .Fig. 4, until the extreme edge ofthe grinding-wheel forms a straight line with the socket of the knife,so that on the grinding-Wheel being'rotated the same revolves and movesback, thus grinding the inwardly-arranged blade from the socket to thepoint inthe same manner. When this has been done sufliciently,the'abutment z is again fixed, the disk 3 turned until thefollowingblade occupies the position of the first one, then stopped, andthe blade which at the moment is adjusted for grinding isground in thesame manner asthe'previous one, and-so on for all the bladesof theknife.

It is evident thatall blades are thus ground in a perfectly uniformmanner. Since the disk 8 always occupies the same position withreference to the grinding-wheel--that is to say,- all the blades alwaysoccupy the same" horizontal position with reference'to the section-ofthe grinding-wheel whether the knife is ground on the one or otherside--and since also the displacement of the knife andof its separateblades canbe limited, a perfectly uniform grindingof all blades isobtained by means of this apparatus, which;

was hitherto impossible in-grinding by hand.

Also by means of this apparatus all incon veniences hitherto connectedwith the grindingof knivesin sausage-machines and the like are thuscompletely removed, and the said'apparatus is consequently renderedindispensable to all butchers, hotel-keepers, and the like. r

' What I claim is- 1 1-- In a machine for grinding knives of the classdescribed, the combination with a grinding-Wheel, meansfor displacingsaid Wheelin an axial direction and means for revolving 5 a said wheel,0f a knife-holder consisting of a disk revolnbly mounted at an angle tothe grinding-wheel, means for moving said disk in a longitudinal andtransverse] direotion','f I means forlimiting the movement'ofsaiddisk,means for holding said disk'against revolution in the desired position,andmeans for adj 'ust-' ablyholding-the knifelto be groundon' said:disk, substantially as desc ribe,d. 2'. In amachine'forgrind-'ng'knives of v,the class described, t he combination withagrind-xjing-fwh eel, means for displacingsaid wheelin f I:

an axial direction and n eans for. revolving said wheel, of aknife-holderjconsisting era disk revolnbly mounted on asu'ppjort, screwsfor moving saidsup'port'in a longitudinal and transverse direction,astop forilimitingthe' movement of said support, a'bolt adaptedto j I iengage holes -i n said disk for holding" the lat-f,

a right and left handed screwin -said disk,-

centrically to a disk, and a shaft carrying said disk, said shaft beinggeared to a shaft'carryQ ing an operating-wheel, andmeans-for rotat 5ingthe grinding-wheel shaft, consisting ofa pulley thereon, connected tosaid operating- ,5

wheel, of a'knife-holder consisting of a disk revolublymounted on asupport, and atan angle to the grinding-wheel, screws for moving saidsupport in a longitudinal and transverse direction, a stop for limitingthe movement of said support, a bolt adaptedto -en-; gage holes in saiddisk forholding the latter- I against revolution in the desiredposition, a

right .and left handed screw in said disk,

clamping-cheeks on said screw, the jaws of which project beyond thesurface of the disk and engage and adjustably hold the knife tobeground, substantially as described.

In witness whereof I have signed this speci fication in the presence oftwo witnesses.

OTTO BECKER.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

